Lipstick casing

ABSTRACT

A lipstick casing includes a rotational base, an outer receiving tube, and an inner receiving seat. The inner receiving seat includes a receptacle for receiving a lipstick. The rotational base includes a screw rod on a top portion thereof. The rotational base is mounted to a bottom of the outer receiving tube, with the screw extending into the outer receiving tube. The inner receiving seat is mounted in the outer receiving tube and includes a screw hole. The screw rod is in threading connection with the screw hole. The lipstick casing is simple in structure, easy to manufacture, and easy to operate during use, providing enhanced utility.

BACKGROUND OF THE INVENTION

The present invention relates to a cosmetic tool and, more particularly, to a lipstick casing.

Lipsticks are widely used in makeup and maintenance of human lips. New lipstick products continually emerge into the market and generally have slight differences in the appearances of the lipstick casings Improvement to the internal structure of the lipstick casings is ignored. Current lipstick casings have more components which requires complicated manufacturing procedures and which have relatively high manufacturing costs. Furthermore, the connection between the components is complicated, and the assemblage of the components takes a longer time. Due to the large number of the components in the lipstick casing, frequent friction occurs among the large numbered after the lipstick casing had been in use for some time, causing great wear in the connection areas between the components. When the wear at the connection areas of the components reaches a certain extent, disengagement occurs between the components. In this case, if a larger external force is applied, the components of the whole lipstick casing disintegrate and fall, leading to unrecoverable damage to the lipstick. This is the biggest drawback of current lipstick casings.

BRIEF SUMMARY OF THE INVENTION

An objective of the present invention is to provide a simple-structure, low-manufacturing cost, easy-to-use lipstick casing to solve the disadvantages of the prior art.

To fulfill the above objective, a lipstick casing according to the present invention includes a rotational base, an outer receiving tube, and an inner receiving seat. The inner receiving seat includes a receptacle adapted to receive a lipstick. The rotational base includes a screw rod on a top portion thereof. The rotational base is mounted to a bottom of the outer receiving tube, with the screw extending into the outer receiving tube. The inner receiving seat is mounted in the outer receiving tube and includes a screw hole. The screw rod is in threading connection with the screw hole.

Preferably, a first annular boss formed at a connecting section between the screw rod and the rotational base. A second annular boss is provided on a lower portion of the screw rod and is located above the first annular boss. The bottom of the outer receiving tube includes an annular groove matching with the first annular boss. The annular groove includes a bottom wall having a through-hole. A plurality of protrusions extends inward from a periphery of the through-hole. When the screw rod extends into the outer receiving tube, the first annular boss is snugly received in the annular groove, and a bottom portion of the first annular boss abuts the plurality of protrusions.

Preferably, a sliding rib is formed on an inner wall of the outer receiving tube. A sliding groove is defined in an outer wall of the inner receiving seat and matches with the sliding rib. The sliding rib is slideably received in the sliding groove such that the outer receiving tube and the inner receiving seat are slideable relative to each other.

Preferably, a cap is mounted around an outer wall of the outer receiving tube.

Preferably, the cap includes an inner wall having a rib. The outer wall of the outer receiving tube includes a ridge. The rib of the cap is snap-fitted below the ridge of the outer receiving tube when the cap is mounted around the outer receiving tube.

Preferably, the screw rod includes an opening in a side thereof.

The lipstick casing according to the present invention provides advantageous effect. In use, a user holds the outer receiving tube with one hand and rotates the rotational base with the other. The screw rod on the top portion of the rotational base rotates due to threading connection between the screw hole of the inner receiving seat and the screw rod. Namely, when the screw rod rotates and, thus, drives the inner receiving seat to move rectilinearly upward in the outer receiving tube, the lipstick received in the inner receiving seat moves upward and extends outward to allow use by the user for makeup and maintenance. The lipstick casing according to the present invention is simple in structure, easy to manufacture, and easy to operate during use, providing enhanced utility.

The present invention will become clearer in light of the following detailed description of illustrative embodiments of this invention described in connection with the drawings.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded, perspective view of a lipstick casing according to the present invention.

FIG. 2 is a cross sectional view of the lipstick casing according to the present invention.

FIG. 3 is a perspective view of a rotational base of the lipstick casing according to the present invention.

FIG. 4 is a perspective view of an outer receiving tube of the lipstick casing according to the present invention.

FIG. 5 is another perspective view of the outer receiving tube.

FIG. 6 is a perspective view of an inner receiving seat of the lipstick casing according to the present invention.

FIG. 7 is a perspective view of a cap of the lipstick casing according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

With reference to FIGS. 1-7, a lipstick casing according to the present invention includes a rotational base 1, an outer receiving tube 2, and an inner receiving seat 3. The inner receiving seat 3 includes a receptacle 33 adapted to receive a lipstick. The rotational base 1 includes a screw rod 11 on a top portion thereof. The rotational base 1 is mounted to a bottom of the outer receiving tube 2, with the screw 11 extending into the outer receiving tube 2. The inner receiving seat 3 is mounted in the outer receiving tube 2 and includes a screw hole 31. The screw rod 11 is in threading connection with the screw hole 31.

In use, a user holds the outer receiving tube 2 with one hand and rotates the rotational base 1 with the other. The screw rod 11 on the top portion of the rotational base 1 rotates due to threading connection between the screw hole 31 of the inner receiving seat 3 and the screw rod 11. Namely, when the screw rod 11 rotates and, thus, drives the inner receiving seat 3 to move rectilinearly upward in the outer receiving tube 2, the lipstick received in the inner receiving seat 3 moves upward and extends outward to allow use by the user for makeup and maintenance. The lipstick casing according to the present invention is simple in structure, easy to manufacture, and easy to operate during use, providing enhanced utility. The receptacle 33 protects the lipstick and allows the lipstick to move upward or downward.

In this embodiment, a first annular boss 12 is formed at a connecting section between the screw rod 11 and the rotational base 1. A second annular boss 13 is provided on a lower portion of the screw rod 11 and is located above the first annular boss 12.

The bottom of the outer receiving tube 2 includes an annular groove 21 matching with the first annular boss 12. The annular groove 21 includes a bottom wall having a through-hole 22. A plurality of protrusions 23 extends inward from a periphery of the through-hole 22.

When the screw rod 11 extends into the outer receiving tube 2, the first annular boss 12 is snugly received in the annular groove 21. A bottom portion of the first annular boss 12 abuts the protrusions 23.

Since the first annular boss 12 abuts the protrusions 23, the protrusions 23 are held on the second annular boss 13, preventing the screw rod 11 extending in the outer receiving tube 2 from disengaging from the through-hole 22 of the annular groove 21. This assures normal operation of the screw rod 11 when the rotational base 1 rotates. The first annular boss 12 matches with the annular groove 21 such that the first annular boss 12 rotates jointly with the rotational base 1 and rotates in the annular groove 21, providing a better connection between the rotational base 1 and the outer receiving tube 2.

In this embodiment, a sliding rib 24 is formed on an inner wall of the outer receiving tube 2. A sliding groove 32 is defined in an outer wall of the inner receiving seat 3 and matches with the sliding rib 24. The sliding rib 24 is slideably received in the sliding groove 32 such that the outer receiving tube 2 and the inner receiving seat 3 are slideable relative to each other. The sliding rib 24 provides a guiding track function to assure stable sliding of the inner receiving seat 3 without rotational movement.

In this embodiment, a cap 4 is mounted around an outer wall of the outer receiving tube 2. In addition to allow easy carriage, the cap 4 protects the lipstick received in the inner receiving seat 3 from dust and water, providing enhanced utility.

In this embodiment, the cap 4 includes an inner wall having a rib 41. The outer wall of the outer receiving tube 2 includes a ridge 25. When the cap 4 is mounted around the outer receiving tube 2, the rib 41 of the cap 4 is snap-fitted below the ridge 25 of the outer receiving tube 2. This arrangement provides a more stable connection to avoid the cap 4 from falling under normal impact.

The screw rod 11 includes an opening in a side thereof. Due to the flat opening in the side of the screw rod 11, when the screw rod 11 is in threading connection with the screw hole 31, a gap exists between the flat portion and a periphery of the screw hole 31. In a case that a portion of the lipstick enters the screw hole 31, the portion of the lipstick enters the gap between he flat portion and the periphery of the screw hole 31 without adversely affecting the rotational movement of the screw rod 11, assuring normal operation of the lipstick casing according to the present invention.

Although specific embodiments have been illustrated and described, numerous modifications and variations are still possible without departing from the scope of the invention. The scope of the invention is limited by the accompanying claims. 

1. A lipstick casing comprising a rotational base, an outer receiving tube, and an inner receiving seat, with the inner receiving seat including a receptacle adapted to receive a lipstick, with the rotational base including a screw rod on a top portion thereof, with the rotational base mounted to a bottom of the outer receiving tube, with the screw extending into the outer receiving tube, with the inner receiving seat mounted in the outer receiving tube and including a screw hole, and with the screw rod in threading connection with the screw hole.
 2. The lipstick casing as claimed in claim 1, with a first annular boss formed at a connecting section between the screw rod and the rotational base, with a second annular boss provided on a lower portion of the screw rod and located above the first annular boss, with the bottom of the outer receiving tube including an annular groove matching with the first annular boss, with the annular groove including a bottom wall having a through-hole, and with a plurality of protrusions extending inward from a periphery of the through-hole, wherein when the screw rod extends into the outer receiving tube, the first annular boss is snugly received in the annular groove, and the first annular boss includes a bottom portion abutting the plurality of protrusions.
 3. The lipstick casing as claimed in claim 1, with the outer receiving tube including an inner wall, with a sliding rib formed on the inner wall of the outer receiving tube, with a sliding groove defined in an outer wall of the inner receiving seat and matching with the sliding rib, with the sliding rib slideably received in the sliding groove, and with the outer receiving tube and the inner receiving seat slideable relative to each other.
 4. The lipstick as claimed in claim 1, further comprising: a cap, with the cap mounted around an outer wall of the outer receiving tube.
 5. The lipstick as claimed in claim 4, with the cap including an inner wall having a rib, with the outer wall of the outer receiving tube including a ridge, and with the rib of the cap snap-fitted below the ridge of the outer receiving tube when the cap is mounted around the outer receiving tube.
 6. The lipstick as claimed in claim 1, with the screw rod including an opening in a side thereof. 